Please use a power bank with an output voltage of 5V, and our package does not include a power bank. Electric Heated Jacket with Hood: the jacket is made by cotton, polyester and waterproof materal, which can help keep warm and preventing water and rain. 4 Heating Areas: The heating component of heated jacket is made of imported carbon fiber, and it has four heated areas, including the left abdomen, right abdomen and the back, back nape position. 3 Heated Temperature Conttrol: Three temperatures can be selected just by only pressing a button on this warm jacket. High temperature: red color(60 C/140 F), Medium temperature: blue color(50 C/122 F), Low temperature: green color(40 C/104F ). Easy To Use: Connect the USB port of the jacket to the power bank, and then press and hold the switch on the chest for 2 seconds, the vest turns on the heating mode.